Upper bound on the smuon mass from vacuum stability in the light of muon $g-2$ anomaly

TL;DR

This paper establishes an upper limit on the smuon mass in supersymmetric models based on vacuum stability constraints, considering the muon g-2 anomaly and precise decay rate calculations.

Contribution

It provides a novel, precise calculation of the electroweak vacuum decay rate incorporating one-loop effects, deriving upper bounds on smuon mass consistent with muon g-2 observations.

Findings

Smoun mass should be less than 1.38 TeV at 1σ

Smoun mass should be less than 1.68 TeV at 2σ

Bound is insensitive to tanβ variations

Abstract

We derive an upper bound on the smuon mass assuming that the muon $g-2$ anomaly is explained by the supersymmetric (SUSY) contribution. In the minimal SUSY standard model, the SUSY contribution to the muon $g-2$ is enhanced when the Higgsino mass parameter is large. Then, the smuon-smuon-Higgs trilinear coupling is enhanced, which may destabilize the electroweak vacuum. We calculate precisely the decay rate of the electroweak vacuum in such a case. We include one-loop effects which are crucial to determine the overall normalization of the decay rate. Requiring that the theoretical prediction of the muon anomalous magnetic moment is consistent with the observed value at the $1$ and $2\sigma$ levels (equal to the central value of the observed value), we found that the lightest smuon mass should be smaller than $1.38$ and $1.68\ {\rm TeV}$ ($1.20\ {\rm TeV}$) for $\tan\beta=10$ (with $\tan\beta$ being the ratio of the vacuum expectation values of the two Higgs bosons), respectively, and the bound is insensitive to the value of $\tan\beta$.